<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>网页计算器</title>
    <script src="jquery-3.3.1.min.js"></script>
    <style>
    #in1{
        color: aqua;
    }
    </style>
</head>
<body>
<input id="in1" width="20" height="10" />
</body>
</html>